
x = input("plese input text\n")
# x=x.lower() 转化成小写
y=input("please input a letter\n") 
# y=y.lower()转化成小写
lst=x.replace(".","").split(' ')
n=False
for i in lst:
    if y in i:
        print (i)
        n=True
if not n:print("Can't find the letter in your text")
